Information transmission method and apparatus, terminal, and device

Abstract

The present disclosure provides an information transmission method and apparatus, a terminal, and a device. The method comprises: sending a first message to a target device on a multi-hop relay link, wherein the first message comprises first information, and the first information comprises at least one of the following: an identifier of a first remote terminal; a local identifier of the first remote terminal; an identifier of a second remote terminal; multi-hop path identifier information; hop count identifier information in a first transmission direction; a combination of the identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal; and terminal identifier information allocated by a network device to the first remote terminal.

Description

Information transmission method and device, terminal and equipment

[0001] The present disclosure claims priority to the Chinese patent application No. 202411000221.9, filed on July 24, 2024, entitled "Information transmission method and device, terminal and equipment", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of communication, in particular to an information transmission method, device, terminal and equipment. BACKGROUND

[0003] In order to expand network coverage, it is considered to introduce relays. Currently, only single-hop terminal-to-terminal relay (UE-to-UE Relay, U2N Relay) and single-hop terminal-to-network relay (UE-to-Network Relay, U2N Relay) are supported, that is, there is only one relay terminal between the opposite ends of the communication, and there is a direct communication interface end-to-end connection between the relay terminal and the remote terminal. Therefore, when one of the link problems occurs, the relay terminal can directly initiate a direct communication interface signaling (PC5-S) connection release.

[0004] However, for a multi-hop relay scenario, there may be no direct communication interface end-to-end connection between the relay terminal and the remote terminal where the link problem occurs, for example, as shown in FIG. 1, the direct communication link between the first relay terminal and the third relay terminal has a problem. Since there is no direct communication interface end-to-end connection between the first relay terminal and the first remote terminal, the PC5-S connection release cannot be initiated, and how to reduce the interruption delay caused by the problem of one of the transmission paths in the multi-hop relay link is a problem to be solved. SUMMARY

[0005] The embodiments of the present disclosure provide an information transmission method, device, terminal and equipment to reduce the communication interruption time in a multi-hop relay scenario.

[0006] In order to solve the above technical problem, the embodiments of the present disclosure provide an information transmission method applied to a first relay terminal, comprising:

[0007] If a first condition is met, a first message is sent to a target device on a multi-hop relay link, and the first condition comprises at least one of the following:

[0008] The direct communication interface between the first relay terminal and the third relay terminal has a radio link failure (RLF);

[0009] The first relay terminal has a handover;

[0010] The first relay terminal has a cell reselection;

[0011] RLF occurs on the Uu interface of the first relay terminal;

[0012] The end-to-end radio resource control (RRC) connection establishment between the first relay terminal and the network device fails;

[0013] The RRC reconfiguration between the first relay terminal and the network device fails;

[0014] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal fails;

[0015] The end-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails;

[0016] The end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails;

[0017] The third relay terminal is a next-hop node of the first relay terminal in a first transmission direction; and the multi-hop relay link includes a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal.

[0018] In some embodiments, the method further includes:

[0019] sending, to the third relay terminal, indication information, the indication information being used to indicate at least one of:

[0020] The first relay terminal performs handover;

[0021] The first relay terminal performs cell reselection;

[0022] RLF occurs on the Uu interface of the first relay terminal;

[0023] The end-to-end radio resource control (RRC) connection establishment between the first relay terminal and the network device fails;

[0024] The RRC reconfiguration between the first relay terminal and the network device fails;

[0025] The end-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails;

[0026] The end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails;

[0027] The third relay terminal is a next-hop node of the first relay terminal in the first transmission direction.

[0028] In some embodiments, the first message further includes second information, and the second information includes at least one of:

[0029] an identifier of the first relay terminal;

[0030] an identifier of a third relay terminal, the third relay terminal being a next-hop node of the first relay terminal in the first transmission direction;

[0031] type indication information.

[0032] In some embodiments, in a case where the multi-hop relay link is a multi-hop relay link of a terminal to a network device, the type indication information is used to indicate any one of:

[0033] RLF occurs on the direct communication interface of the first relay terminal;

[0034] handover occurs for the first relay terminal;

[0035] cell reselection occurs for the first relay terminal;

[0036] RLF occurs on a Uu interface of the first relay terminal;

[0037] end-to-end RRC connection establishment between the first relay terminal and the network device fails;

[0038] RRC reconfiguration between the first relay terminal and the network device fails;

[0039] RRC reconfiguration of the direct communication interface of the first relay terminal fails.

[0040] In some embodiments, in a case where the multi-hop relay link is a multi-hop relay link of a terminal to a terminal, the type indication information is used to indicate any one of:

[0041] RLF occurs on the direct communication interface of the first relay terminal;

[0042] RRC reconfiguration of the direct communication interface of the first relay terminal fails;

[0043] end-to-end RRC connection establishment between the first relay terminal and a second remote terminal fails;

[0044] end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

[0045] In some embodiments, the first message includes first information, the first information including at least one of:

[0046] an identifier of the first remote terminal;

[0047] a local identifier of the first remote terminal;

[0048] an identifier of the second remote terminal;

[0049] multi-hop path identification information;

[0050] hop number identification information in the first transmission direction;

[0051] a combination of an identification of the first remote terminal and an identification of a target communication peer of the first remote terminal;

[0052] terminal identification information allocated by the network device for the first remote terminal;

[0053] wherein the first remote terminal is a first terminal in the first transmission direction, and the target communication peer of the first remote terminal is a second remote terminal or a network device; the target device is a previous hop node of a first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal;

[0054] the first transmission direction includes one of:

[0055] a transmission direction from the first remote terminal to the network device;

[0056] an uplink transmission direction;

[0057] a transmission direction from the first remote terminal to the second remote terminal.

[0058] In some embodiments, the first message is a direct communication interface notification message.

[0059] The embodiments of the present disclosure further provide an information transmission method, applied to a target device, comprising:

[0060] receiving a first message sent by a first relay terminal on a multi-hop relay link;

[0061] wherein the first remote terminal is a first terminal in the first transmission direction, and the target communication peer of the first remote terminal is a second remote terminal or a network device; the target device is a previous hop node of a first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal;

[0062] the first transmission direction includes one of:

[0063] a transmission direction from the first remote terminal to the network device;

[0064] an uplink transmission direction;

[0065] a transmission direction from the first remote terminal to the second remote terminal.

[0066] In some embodiments, when the target device is a second relay terminal, the method further comprises:

[0067] determining, according to the first message, whether to send a second message to a previous hop node of the target device in the first transmission direction;

[0068] wherein the first information is included in the second message in a case where the previous hop node of the target device in the first transmission direction is a relay terminal.

[0069] In some embodiments, the multi-hop relay link comprises a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal; and the first message further comprises second information, the second information comprising at least one of:

[0070] an identity of the first relay terminal;

[0071] an identity of a third relay terminal, the third relay terminal being a next hop node of the first relay terminal in the first transmission direction;

[0072] type indication information.

[0073] In some embodiments, in a case where the multi-hop relay link is a multi-hop relay link from a terminal to a network device, the type indication information is used to indicate any one of:

[0074] RLF of a direct communication interface of the first relay terminal;

[0075] handover of the first relay terminal;

[0076] cell reselection of the first relay terminal;

[0077] RLF of a Uu interface of the first relay terminal;

[0078] failure of end-to-end RRC connection establishment between the first relay terminal and a network device;

[0079] failure of RRC reconfiguration between the first relay terminal and a network device;

[0080] failure of RRC reconfiguration of a direct communication interface of the first relay terminal.

[0081] In some embodiments, in a case where the multi-hop relay link is a multi-hop relay link from a terminal to a terminal, the type indication information is used to indicate any one of:

[0082] RLF of a direct communication interface of the first relay terminal;

[0083] failure of RRC reconfiguration of a direct communication interface of the first relay terminal;

[0084] failure of end-to-end RRC connection establishment between the first relay terminal and a second remote terminal;

[0085] An end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

[0086] In some embodiments, the first message includes first information, and the first information includes at least one of:

[0087] An identifier of the first remote terminal;

[0088] A local identifier of the first remote terminal;

[0089] An identifier of the second remote terminal;

[0090] Multi-hop path identification information;

[0091] Hop number identification information in a first transmission direction;

[0092] A combination of an identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal;

[0093] Terminal identification information allocated to the first remote terminal by the network device.

[0094] In some embodiments, the first message is a direct communication interface notification message.

[0095] The embodiments of the present disclosure also provide an information transmission method, applied to a third relay terminal, including:

[0096] In a case where a second condition is met, sending a third message to a target communication peer of the first remote terminal on a multi-hop relay link;

[0097] The second condition includes at least one of:

[0098] A radio link failure (RLF) occurs in a direct communication interface between the first relay terminal and the third relay terminal;

[0099] Receiving indication information sent by the first relay terminal;

[0100] An RRC reconfiguration in a direct communication interface between the first relay terminal and the third relay terminal fails;

[0101] The indication information is used to indicate at least one of:

[0102] The first relay terminal performs handover;

[0103] The first relay terminal performs cell reselection;

[0104] The first relay terminal performs an RLF on a Uu interface;

[0105] An end-to-end RRC connection establishment between the first relay terminal and the network device fails;

[0106] RRC reconfiguration failure between the first relay terminal and the network device;

[0107] End-to-end RRC connection establishment failure between the first relay terminal and the second remote terminal;

[0108] End-to-end RRC reconfiguration failure between the first relay terminal and the second remote terminal.

[0109] In some embodiments, the target communication peer of the first remote terminal is a second remote terminal or a network device;

[0110] The third message includes third information, and the third information includes at least one of the following:

[0111] An identifier of the first remote terminal;

[0112] A local identifier of the first remote terminal;

[0113] An identifier of a second remote terminal, which is a communication peer of the first remote terminal;

[0114] Multi-hop path identification information;

[0115] Hop number identification information in a first transmission direction;

[0116] A combination of an identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal;

[0117] Terminal identification information allocated to the first remote terminal by the network device;

[0118] Transmission direction indication information;

[0119] Type indication information;

[0120] The first remote terminal is a first terminal in a first transmission direction; and the third relay terminal is a next hop node of the first relay terminal in the first transmission direction;

[0121] The first transmission direction includes one of the following:

[0122] A transmission direction from the first remote terminal to the network device;

[0123] An uplink transmission direction;

[0124] A transmission direction from the first remote terminal to a second remote terminal.

[0125] The embodiments of the present disclosure also provide a relay terminal, which is a first relay terminal, including a memory, a transceiver, and a processor.

[0126] a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

[0127] if the first condition is met, sending a first message to a target device on a multi-hop relay link, the first condition comprising at least one of:

[0128] a radio link failure, RLF, occurs on a direct communication interface between the first relay terminal and a third relay terminal;

[0129] a handover occurs for the first relay terminal;

[0130] a cell reselection occurs for the first relay terminal;

[0131] an RLF occurs on a Uu interface for the first relay terminal;

[0132] an end-to-end radio resource control, RRC, connection establishment between the first relay terminal and a network device fails;

[0133] an RRC reconfiguration between the first relay terminal and the network device fails;

[0134] an RRC reconfiguration between the first relay terminal and the third relay terminal fails;

[0135] an end-to-end RRC connection establishment between the first relay terminal and a second remote terminal fails;

[0136] an end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails;

[0137] wherein the third relay terminal is a next hop node for the first relay terminal in a first transmission direction; and the multi-hop relay link comprises a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal.

[0138] In some embodiments, the processor for reading the computer program in the memory further performs the following operations:

[0139] sending indication information to the third relay terminal, the indication information being used to indicate at least one of:

[0140] a handover occurs for the first relay terminal;

[0141] a cell reselection occurs for the first relay terminal;

[0142] an RLF occurs on a Uu interface for the first relay terminal;

[0143] an end-to-end radio resource control, RRC, connection establishment between the first relay terminal and a network device fails;

[0144] an RRC reconfiguration failure between the first relay terminal and the network device;

[0145] an end-to-end RRC connection setup failure between the first relay terminal and the second remote terminal;

[0146] an end-to-end RRC reconfiguration failure between the first relay terminal and the second remote terminal;

[0147] wherein the third relay terminal is a next-hop node of the first relay terminal in the first transmission direction.

[0148] In some embodiments, the first message further comprises second information, the second information comprising at least one of:

[0149] an identity of the first relay terminal;

[0150] an identity of the third relay terminal, the third relay terminal being a next-hop node of the first relay terminal in the first transmission direction;

[0151] type indication information.

[0152] In some embodiments, in a case where the multi-hop relay link is a multi-hop relay link from a terminal to a network device, the type indication information is used to indicate any one of:

[0153] RLF occurs on a direct communication interface of the first relay terminal;

[0154] handover occurs for the first relay terminal;

[0155] cell reselection occurs for the first relay terminal;

[0156] RLF occurs on a Uu interface of the first relay terminal;

[0157] an end-to-end RRC connection setup failure between the first relay terminal and the network device;

[0158] an RRC reconfiguration failure between the first relay terminal and the network device;

[0159] RLF occurs on a direct communication interface of the first relay terminal.

[0160] In some embodiments, in a case where the multi-hop relay link is a multi-hop relay link from a terminal to a terminal, the type indication information is used to indicate any one of:

[0161] RLF occurs on a direct communication interface of the first relay terminal;

[0162] RLF occurs on a direct communication interface of the first relay terminal.

[0163] The end-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails;

[0164] The end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

[0165] In some embodiments, the first message includes first information, and the first information includes at least one of the following:

[0166] An identifier of the first remote terminal;

[0167] A local identifier of the first remote terminal;

[0168] An identifier of the second remote terminal;

[0169] Multi-hop path identification information;

[0170] Hop number identification information in the first transmission direction;

[0171] A combination of an identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal;

[0172] Terminal identification information allocated to the first remote terminal by the network device;

[0173] The first remote terminal is the first terminal in the first transmission direction, and the target communication peer of the first remote terminal is a second remote terminal or a network device; the target device is a previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal;

[0174] The first transmission direction includes one of the following:

[0175] A transmission direction from the first remote terminal to the network device;

[0176] An uplink transmission direction;

[0177] A transmission direction from the first remote terminal to the second remote terminal.

[0178] In some embodiments, the first message is a direct communication interface notification message.

[0179] The embodiments of the present disclosure also provide a target device, which is a first remote terminal or a second relay terminal, comprising a memory, a transceiver, and a processor:

[0180] The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0181] receive a first message sent by a first relay terminal on a multi-hop relay link;

[0182] wherein the first remote terminal is a first terminal in a first transmission direction, a target communication peer of the first remote terminal is a second remote terminal or a network device, the target device is a previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal;

[0183] the first transmission direction includes one of:

[0184] a transmission direction from the first remote terminal to the network device;

[0185] an uplink transmission direction;

[0186] a transmission direction from the first remote terminal to the second remote terminal.

[0187] In some embodiments, when the target device is the second relay terminal, the processor, for reading the computer program in the memory, further performs the following operations:

[0188] determining, according to the first message, whether to send a second message to a previous hop node of the target device in the first transmission direction;

[0189] wherein the first information is included in the second message when the previous hop node of the target device in the first transmission direction is a relay terminal.

[0190] In some embodiments, the multi-hop relay link includes a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal, and the first message further includes second information, the second information including at least one of:

[0191] an identifier of the first relay terminal;

[0192] an identifier of a third relay terminal, the third relay terminal being a next hop node of the first relay terminal in the first transmission direction;

[0193] type indication information.

[0194] In some embodiments, when the multi-hop relay link is a multi-hop relay link from a terminal to a network device, the type indication information is used to indicate any of:

[0195] RLF occurs on a direct communication interface of the first relay terminal;

[0196] handover occurs on the first relay terminal;

[0197] cell reselection occurs on the first relay terminal;

[0198] RLF occurs on the Uu interface of the first relay terminal;

[0199] The end-to-end RRC connection establishment between the first relay terminal and the network device fails;

[0200] The RRC reconfiguration between the first relay terminal and the network device fails;

[0201] The direct communication interface RRC reconfiguration of the first relay terminal fails.

[0202] In some embodiments, in the case that the multi-hop relay link is a terminal-to-terminal multi-hop relay link, the type indication information is used to indicate any of the following:

[0203] RLF occurs on the direct communication interface of the first relay terminal;

[0204] The direct communication interface RRC reconfiguration of the first relay terminal fails;

[0205] The end-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails;

[0206] The end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

[0207] In some embodiments, the first message includes first information, and the first information includes at least one of the following:

[0208] An identifier of the first remote terminal;

[0209] A local identifier of the first remote terminal;

[0210] An identifier of the second remote terminal;

[0211] Multi-hop path identification information;

[0212] Hop count identification information in the first transmission direction;

[0213] A combination of an identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal;

[0214] Terminal identification information allocated to the first remote terminal by the network device.

[0215] In some embodiments, the first message is a direct communication interface notification message.

[0216] Embodiments of the present disclosure also provide a relay terminal, which is a third relay terminal, comprising a memory, a transceiver, and a processor:

[0217] a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

[0218] in a case where a second condition is met, sending a third message to a target communication peer of the first remote terminal on the multi-hop relay link; wherein the second condition comprises at least one of the following:

[0219] a radio link failure, RLF, occurs in a direct communication interface between the first relay terminal and a third relay terminal;

[0220] the indication information sent by the first relay terminal is received;

[0221] an RRC reconfiguration fails in the direct communication interface between the first relay terminal and the third relay terminal;

[0222] wherein the indication information is used to indicate at least one of the following:

[0223] the first relay terminal performs handover;

[0224] the first relay terminal performs cell reselection;

[0225] an RLF occurs in a Uu interface of the first relay terminal;

[0226] an end-to-end RRC connection establishment fails between the first relay terminal and a network device;

[0227] an RRC reconfiguration fails between the first relay terminal and the network device;

[0228] an end-to-end RRC connection establishment fails between the first relay terminal and a second remote terminal;

[0229] an end-to-end RRC reconfiguration fails between the first relay terminal and the second remote terminal.

[0230] In some embodiments, the target communication peer of the first remote terminal is a second remote terminal or a network device;

[0231] wherein the third message comprises third information, and the third information comprises at least one of the following:

[0232] an identifier of the first remote terminal;

[0233] a local identifier of the first remote terminal;

[0234] an identifier of a second remote terminal, the second remote terminal being a communication peer of the first remote terminal;

[0235] multi-hop path identification information;

[0236] The hop number identification information in the first transmission direction;

[0237] The combination of the identification of the first remote terminal and the identification of the target communication opposite end of the first remote terminal;

[0238] The terminal identification information allocated by the network device for the first remote terminal;

[0239] The transmission direction indication information;

[0240] The type indication information;

[0241] The first remote terminal is the first terminal in the first transmission direction; and the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0242] The first transmission direction includes one of the following:

[0243] The transmission direction of the first remote terminal to the network device;

[0244] The uplink transmission direction;

[0245] The transmission direction of the first remote terminal to the second remote terminal.

[0246] The embodiments of the present disclosure further provide an information transmission device, applied to a first relay terminal, and comprising:

[0247] The first sending unit is configured to send a first message to a target device on a multi-hop relay link if a first condition is met, and the first condition includes at least one of the following:

[0248] A radio link failure (RLF) occurs in a direct communication interface between the first relay terminal and the third relay terminal;

[0249] The first relay terminal performs handover;

[0250] The first relay terminal performs cell reselection;

[0251] The first relay terminal performs an RLF on a Uu interface;

[0252] An end-to-end radio resource control (RRC) connection between the first relay terminal and a network device fails to be established;

[0253] An RRC reconfiguration between the first relay terminal and the network device fails;

[0254] An RRC reconfiguration between the first relay terminal and the third relay terminal fails;

[0255] An end-to-end RRC connection between the first relay terminal and the second remote terminal fails to be established;

[0256] An end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails;

[0257] The third relay terminal is a next-hop node of the first relay terminal in a first transmission direction.

[0258] The embodiments of the present disclosure further provide an information transmission apparatus applied to a target device, comprising:

[0259] The first receiving unit is configured to receive a first message sent by a first relay terminal on a multi-hop relay link.

[0260] The first remote terminal is a first terminal in the first transmission direction, and a target communication peer of the first remote terminal is a second remote terminal or a network device.

[0261] The first transmission direction includes one of the following:

[0262] A transmission direction from the first remote terminal to a network device.

[0263] An uplink transmission direction.

[0264] A transmission direction from the first remote terminal to a second remote terminal.

[0265] The embodiments of the present disclosure further provide an information transmission apparatus applied to a third relay terminal, comprising:

[0266] The second sending unit is configured to send a third message to a target communication peer of a first remote terminal on a multi-hop relay link when a second condition is met.

[0267] The second condition includes at least one of the following:

[0268] A radio link failure (RLF) occurs in a direct communication interface between the first relay terminal and the third relay terminal.

[0269] The indication information is received.

[0270] An RRC reconfiguration fails in the direct communication interface between the first relay terminal and the third relay terminal.

[0271] The indication information is used to indicate at least one of the following:

[0272] The first relay terminal performs handover.

[0273] The first relay terminal performs cell reselection.

[0274] RLF occurs on the Uu interface of the first relay terminal;

[0275] The end-to-end RRC connection establishment between the first relay terminal and the network device fails;

[0276] The RRC reconfiguration between the first relay terminal and the network device fails;

[0277] The end-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails;

[0278] The end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

[0279] The embodiment of the present disclosure further provides a processor readable storage medium, which stores a program for causing the processor to execute the above method.

[0280] The embodiment of the present disclosure further provides a computer program product, which comprises computer instructions, and the computer instructions are executed by the processor to implement the steps of the above method.

[0281] The present disclosure has the following beneficial effects:

[0282] The above scheme can ensure that the communication processing can be performed in time when the link of the relay terminal in the multi-hop relay scenario has a problem, reduce the communication interruption time, and improve the user experience, by sending the first message to the previous hop node of the first relay terminal in the first transmission direction of the multi-hop relay link to inform the previous hop node of the link problem. BRIEF DESCRIPTION OF DRAWINGS

[0283] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present disclosure, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0284] FIG. 1 shows a schematic diagram of a one-hop link problem in a multi-hop relay link;

[0285] FIG. 2 shows a structure diagram of a network system suitable for the embodiment of the present disclosure;

[0286] FIG. 3 shows one of the flow diagrams of the information transmission method of the embodiment of the present disclosure;

[0287] FIG. 4 shows a communication architecture schematic diagram of application case one;

[0288] FIG. 5 shows a flow diagram of application case one;

[0289] Figure 6 shows a schematic diagram of a communication architecture for case two;

[0290] Figure 7 shows a schematic diagram of a flow for case two;

[0291] Figure 8 shows a schematic diagram of a flow of an information transmission method according to an embodiment of the present disclosure;

[0292] Figure 9 shows a schematic diagram of a flow of an information transmission method according to an embodiment of the present disclosure;

[0293] Figure 10 shows a schematic diagram of units of an information transmission apparatus according to an embodiment of the present disclosure;

[0294] Figure 11 shows a schematic diagram of a structure of a relay terminal according to an embodiment of the present disclosure;

[0295] Figure 12 shows a schematic diagram of units of an information transmission apparatus according to an embodiment of the present disclosure;

[0296] Figure 13 shows a schematic diagram of units of an information transmission apparatus according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0297] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present disclosure.

[0298] The terms "first", "second", and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in other sequences than those illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product, or device.

[0299] The term "and / or" in the embodiments of the present disclosure describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects. The term "multiple" in the embodiments of the present disclosure means two or more, and other quantifiers are similar.

[0300] In the embodiments of the present disclosure, the word "exemplary" or "for example" is used to mean serving as an example or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present disclosure should not be interpreted as being more preferred or advantageous than other embodiments or designs. In fact, a word "exemplary" or "for example" is used to present concepts in a concrete manner.

[0301] The related concepts mentioned in the present disclosure are briefly described as follows.

[0302] 1. Cellular network communication

[0303] The conventional wireless communication adopts a cellular network communication mode, that is, a terminal and a network device perform uplink and downlink data / control information transmission through a Uu interface.

[0304] 2. Direct communication

[0305] Direct communication refers to a mode in which terminals in proximity can perform data transmission within a short distance range through a direct communication link (also referred to as a Sidelink or PC5 link or a sidelink). The wireless interface corresponding to the Sidelink is referred to as a direct communication interface (also referred to as a Sidelink interface or PC5 interface or sidelink interface).

[0306] 3. Relay

[0307] In order to expand network coverage, U2N relay can be considered to be introduced. The relay itself can be a terminal with a relay function.

[0308] For U2N relay, the interface between the relay and the network uses a Uu interface, and the interface between the relayed terminal (hereinafter referred to as a remote terminal) and the network uses a direct communication interface. Single-hop U2N relay means that the relay terminal can be directly connected to the network device. For a remote terminal in a deep blind area, if the remote terminal cannot be connected to the network through one relay terminal, it needs to be connected to the network device through multi-hop relay.

[0309] For a multi-hop relay scenario, there is a Uu interface between the last-hop relay and the network device, which is generally referred to as U2N relay. Other relays located between the remote terminal and the last-hop relay are generally referred to as intermediate relays (Intermediate Relay). For Intermediate Relay, it can also be referred to as U2N relay according to the service it provides, which is to forward data between the remote terminal and the network device, or it can be referred to as U2U relay according to its location, which is located between two terminals. In the present disclosure, the name is not limited.

[0310] Likewise, to extend the coverage of terminals, U2U relaying can be considered. The relay itself can be a terminal with relaying functionality.

[0311] For U2U relaying, the interface between the relay terminal and the relayed terminal (in this disclosure simply referred to as remote terminal) uses the direct communication interface. If the distance between two remote terminals is too far to communicate using one relay terminal, multi-hop U2U relaying can be introduced, the interface between the relay terminal and the remote terminal and the interface between different relay terminals are all direct communication interfaces, these relay terminals can be referred to as Intermediate Relay. For Intermediate Relay, since the service it provides is to forward terminal-to-terminal data, it can also be referred to as U2U Relay. In this disclosure, the name is not limited.

[0312] Embodiments of the present disclosure are described below with reference to the accompanying drawings. The information transmission method, apparatus, terminal and device provided by the embodiments of the present disclosure can be applied to a wireless communication system. The wireless communication system can be a system using the fifth generation (5th Generation, 5G) mobile communication technology (hereinafter referred to as 5G system), and those skilled in the art can understand that the 5G NR system is only an example and is not limited.

[0313] Referring to FIG. 2, FIG. 2 is a structure diagram of a network system to which embodiments of the present disclosure can be applied. As shown in FIG. 2, the network system includes a plurality of user terminals 11 and a base station 12. The user terminal 11 can be a user equipment (User Equipment, UE), such as a mobile phone, a tablet personal computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (personal digital assistant, PDA), a mobile Internet device (Mobile Internet Device, MID), or a wearable device, and the like. It should be noted that the specific type of user terminal 11 is not limited in the embodiments of the present disclosure. The base station 12 can be a 5G and later version base station (e.g., gNB, 5G NR NB), or a base station in other communication systems, or a node B. It should be noted that the 5G base station is only an example in the embodiments of the present disclosure, and the specific type of base station 12 is not limited.

[0314] The embodiments of the present disclosure provide an information transmission method, apparatus, terminal and device to reduce the communication interruption time in a multi-hop relay scenario.

[0315] The method and the device are based on the same disclosure concept, and the implementation of the device and the method can be referred to each other because the principles of the method and the device for solving problems are similar, and the repeated parts will not be described again.

[0316] It should be noted that in the embodiments of the present disclosure, in one case, there are at least a first relay terminal between the first remote terminal and the network device, and a second relay terminal and a third relay terminal, wherein the next hop node of the first relay terminal in the transmission direction from the first remote terminal to the network device is the third relay terminal, and the previous hop node is the second relay terminal, that is, the first remote terminal is connected with the network device at least through the second relay terminal, the first relay terminal and the third relay terminal, that is, the message of the end-to-end RRC connection between the first remote terminal and the network device is at least forwarded through the second relay terminal, the first relay terminal and the third relay terminal; in another case, there are at least a first relay terminal between the first remote terminal and the second remote terminal, and a second relay terminal and a third relay terminal, wherein the next hop node of the first relay terminal in the transmission direction from the first remote terminal to the second remote terminal is the third relay terminal, and the previous hop node is the second relay terminal, that is, the first remote terminal is connected with the second remote terminal at least through the second relay terminal, the first relay terminal and the third relay terminal, that is, the message of the end-to-end RRC connection between the first remote terminal and the second remote terminal is at least forwarded through the second relay terminal, the first relay terminal and the third relay terminal. The above is only an example of including three relay terminals, of course, it is not excluded that more than three relay terminals are included, for example, in the transmission direction from the first remote terminal to the network device or in the transmission direction from the first remote terminal to the second remote terminal, the previous hop node of the second remote terminal is still a relay terminal, and the next hop node of the third remote terminal is still a relay terminal.

[0317] As shown in FIG. 3, the embodiments of the present disclosure provide an information transmission method, which is executed by a first relay terminal and includes the following steps:

[0318] In step S301, a first message is sent to a target device on a multi-hop relay link.

[0319] In some embodiments, the target device is a previous hop node of the first relay terminal in a first transmission direction of the multi-hop relay link, and the previous hop node of the first relay terminal is a first remote terminal or a second relay terminal; in some embodiments, the first remote terminal in the embodiments of the present disclosure is the first terminal in the first transmission direction.

[0320] It should be noted that the first message in the embodiments of the present disclosure can be understood as a message fed back by the first relay terminal to the previous hop node that the multi-hop relay link has a problem, and the target device can know that the multi-hop relay link has a problem after receiving the first message.

[0321] In some embodiments, the multi-hop relay link in the embodiments of the present disclosure includes a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal.

[0322] In some embodiments, the first message includes first information, and the first information includes at least one of the following:

[0323] A11, an identifier of the first remote terminal;

[0324] In some embodiments, the identifier of the first remote terminal can refer to a layer 2 identifier of the remote terminal. The layer 2 identifier can be a destination layer 2 identifier (Destination L2 ID). The destination layer 2 identifier is for the first relay terminal, i.e., the first remote terminal is the target communication peer of the direct communication interface of the first relay terminal.

[0325] A12, a local identifier of the first remote terminal;

[0326] It should be noted that the local identifier can be understood as a local identifier corresponding to the layer 2 identifier allocated by the network device for the first remote terminal. The local identifier occupies fewer bits than the layer 2 identifier, and the Sidelink Relay Adaptation Protocol (SRAP) header transmits the local identifier, which has less overhead than transmitting the layer 2 identifier.

[0327] A13, an identifier of a second remote terminal;

[0328] It should be noted that the second remote terminal refers to the communication peer of the direct communication interface of the first remote terminal, which is applicable to the case of U2U relay.

[0329] A14, multi-hop path identification information;

[0330] It should be noted that the multi-hop path identification information is used to identify a multi-hop transmission path, such as a path number (Path ID).

[0331] A15, hop count identification information in the first transmission direction;

[0332] In some embodiments, the hop count identification information is used to indicate the hop number corresponding to the hop where a problem occurred on the multi-hop transmission path. For example, the hop count identification information is used to indicate which hop (Hop) the first relay terminal is in the first transmission direction of the multi-hop relay link. It should be noted that when identifying the hop count on the multi-hop relay link, the hop count can be assigned only to the hops between relay terminals, or the hops between each node on the multi-hop relay link can be assigned together. For example, a link includes a remote terminal, a first relay terminal, a second relay terminal, and a network device. When only the hops between relay terminals are assigned, the hop count identification information corresponding to the hop between the first relay terminal and the second relay terminal can be hop number 1. If the hops between each node are assigned together, the hop count identification information corresponding to the hop between the first relay terminal and the second relay terminal can be hop number 2.

[0333] A16. A combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0334] It should be noted that in this case, the identifiers of the first remote terminal and its target communication peer are communicated to the previous hop node together.

[0335] In some embodiments, the target communication peer of the first remote terminal is a second remote terminal or a network device.

[0336] In the case of a multi-hop U2U relay scenario (i.e., a terminal-to-terminal multi-hop relay link scenario), the combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal can be a combination of the source layer 2 address (SRC L2 ID) and the target layer 2 address (DST L2 ID).

[0337] In the case of a multi-hop U2N relay scenario (i.e., a multi-hop relay link scenario from the terminal to the network device), the identifier of the first remote terminal can be the Cell-Radio Network Temporary Identity (C-RNTI), and the identifier of the network device can be the base station identifier (GNB ID).

[0338] A17. Terminal identification information assigned by the network device to the first remote terminal;

[0339] It should be noted that this situation applies to U2N relay scenarios, where the terminal identification information assigned by the network device to the first remote terminal can be, for example, a Cell Radio Network Temporary Identifier (C-RNTI).

[0340] In some embodiments, the first transmission direction includes one of the following:

[0341] A21. Transmission direction from the first remote terminal to the network device;

[0342] A22, Uplink transmission direction;

[0343] It should be noted that A21 and A22 mentioned above apply to the case of U2N relays.

[0344] A23. The transmission direction from the first remote terminal to the second remote terminal;

[0345] It should be noted that this applies to U2U relay scenarios.

[0346] It should be noted that by sending a first message to the previous hop node of the first relay terminal in the first transmission direction of the multi-hop relay link to notify the previous hop node of the link problem, it is possible to ensure timely communication processing when the relay terminal encounters a link problem in a multi-hop relay scenario, thereby reducing communication interruption time and improving user experience.

[0347] In some embodiments, in one implementation, sending the first message to the target device on the multi-hop relay link includes:

[0348] If the first condition is met, a first message is sent to the target device on the multi-hop relay link, wherein the first condition includes at least one of the following:

[0349] B11. A radio link failure (RLF) occurred at the direct communication interface between the first relay terminal and the third relay terminal.

[0350] It should be noted that, in the embodiments of this disclosure, the third relay terminal is the next-hop node of the first relay terminal in the first transmission direction.

[0351] In some embodiments, an RLF occurring on the direct communication interface between the first relay terminal and the third relay terminal can be understood as the direct communication interface between the first relay terminal and the third relay terminal meeting the conditions for an RLF. These conditions include, but are not limited to, any of the following: the Radio Link Control (RLC) retransmission between the first relay terminal and the third relay terminal reaches the maximum number of times; the Hybrid Automatic Repeat Request (HARQ) Discontinuous Reception (DTX) transmission between the first relay terminal and the third relay terminal reaches the maximum number of times; or a problem occurs at the physical layer of the direct communication link between the first relay terminal and the third relay terminal.

[0352] B12. The first relay terminal has been switched over;

[0353] In some embodiments, the handover of the first relay terminal can be understood as the first relay terminal changing its serving cell.

[0354] B13. Cell reselection occurs at the first relay terminal;

[0355] In some embodiments, the cell reselection of the first relay terminal can be understood as the first relay terminal changing the cell it is camping on.

[0356] B14. The first relay terminal experiences an RLF on the Uu interface;

[0357] In some embodiments, the occurrence of an RLF on the Uu interface by the first relay terminal can be understood as an RLF occurring between the first relay terminal and the network device it accesses.

[0358] B15. The end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device failed to be established.

[0359] It should be noted that the failure to establish an end-to-end RRC connection between the first relay terminal and the network device indicates that the first relay terminal is unable to establish an end-to-end RRC connection with the network device.

[0360] B16. RRC reconfiguration between the first relay terminal and the network device failed;

[0361] It should be noted that the failure of RRC reconfiguration between the first relay terminal and the network device indicates a problem with the end-to-end RRC connection between the terminal and the network device, preventing normal data transmission.

[0362] B17. The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed;

[0363] In some embodiments, the failure of RRC reconfiguration of the direct communication interface between the first relay terminal and the third relay terminal can be understood as a problem with the PC5-RRC connection of the direct communication interface between the first relay terminal and the third relay terminal, which prevents normal data transmission.

[0364] B18. The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established.

[0365] It should be noted that the failure to establish an end-to-end RRC connection between the first relay terminal and the second remote terminal indicates that the first relay terminal is unable to establish an end-to-end RRC connection with the second remote terminal.

[0366] B19. End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed;

[0367] It should be noted that the failure of end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal indicates that there is a problem with the end-to-end RRC connection between the first relay terminal and the second remote terminal, and normal data transmission is not possible.

[0368] It should be noted that if any of A11-A19 occurs, it indicates a problem with the multi-hop relay link, and the first remote terminal will be unable to communicate normally with the other end.

[0369] It should be noted that by sending a first message to the target device on the multi-hop relay link in the event of a problem, communication processing can be carried out in a timely manner when the relay terminal's link is interrupted in a multi-hop relay scenario, thus avoiding excessively long communication interruption time and affecting user experience.

[0370] In some embodiments, for a U2N multi-hop trunk link, the first condition described above includes at least one of B11-B17; for a U2U multi-hop trunk link, the first condition described above includes at least one of B11 and B17-B19.

[0371] In some embodiments, in one implementation, the first message further includes second information, the second information including at least one of the following:

[0372] C11, Identification of the first relay terminal;

[0373] C12, Identification of the third relay terminal;

[0374] C13, Type indication information;

[0375] It should be noted that in this case, the first relay terminal needs to inform the previous hop node what kind of problem has occurred in the link. C11 and C12 are used to indicate to the previous hop node which relay terminals have experienced link problems.

[0376] In some embodiments, under one implementation, when the multi-hop trunk link is a terminal-to-network device multi-hop trunk link (i.e., a U2N multi-hop trunk link), the type indication information is used to indicate any of the following:

[0377] C131, The direct communication interface of the first relay terminal experiences an RLF (Redirect Frequency Error).

[0378] In some embodiments, an RLF occurring on the direct communication interface of the first relay terminal can be understood as an RLF occurring on the direct communication interface between the first relay terminal and the third relay terminal.

[0379] C132, The first relay terminal has been switched over;

[0380] C133, Cell reselection occurs at the first relay terminal;

[0381] C134. The first relay terminal experiences an RLF on the Uu interface;

[0382] C135, The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0383] C136, RRC reconfiguration between the first relay terminal and the network device failed;

[0384] C137. The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0385] In some embodiments, the failure of the direct communication interface RRC reconfiguration of the first relay terminal can be understood as the failure of the direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal.

[0386] In some embodiments, under one implementation, when the multi-hop trunk link is an end-to-end multi-hop trunk link (i.e., a U2U multi-hop trunk link), the type indication information is used to indicate any of the following:

[0387] C1301, The direct communication interface of the first relay terminal experiences an RLF (Redirect Frequency Error).

[0388] In some embodiments, an RLF occurring on the direct communication interface of the first relay terminal can be understood as an RLF occurring on the direct communication interface between the first relay terminal and the third relay terminal.

[0389] C1302, The direct communication interface RRC reconfiguration of the first relay terminal failed;

[0390] In some embodiments, the failure of the direct communication interface RRC reconfiguration of the first relay terminal can be understood as the failure of the direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal.

[0391] C1303, the end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0392] C1304, End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0393] It should be noted that, after the target device receives the first message, in some embodiments, under one implementation, if the target device is a first remote terminal, the first remote terminal may perform at least one of the following operations:

[0394] D11, Community Survey;

[0395] D12, U2N relay terminal transmission;

[0396] D13, U2U relay terminal detected;

[0397] D14, Single-hop U2N trunk terminal reselection;

[0398] D15, Multi-hop U2N trunk terminal reselection;

[0399] D16, Single-hop U2U trunk terminal reselection;

[0400] D17, Multi-hop U2U trunk terminal reselection.

[0401] In some embodiments, under another implementation, if the target device is a second relay terminal, the target device also needs to perform the following process:

[0402] Based on the first message, it is determined whether to send a second message to the upstream node of the target device in the first transmission direction. If it is necessary to send a second message to the upstream node of the target device, and if the upstream node of the target device in the first transmission direction is a first remote terminal, the second message may or may not include the first information. If the first information is not included, the first remote terminal, upon receiving the second message, will know that there is a problem with the multi-hop relay link and can execute at least one of D11-D17 above. If the first information is included, the first remote terminal, upon receiving the second message, can obtain more detailed information and can also execute at least one of D11-D17 above. If the upstream node of the target device in the first transmission direction is a relay terminal, the second message needs to include the first information so that the first information continues to be transmitted to the upstream node until the first remote terminal obtains information that there is a problem with the multi-hop relay link. In this case, the purpose of including the first information in the second message is to facilitate the second relay in determining the upstream node, for example, by determining the upstream node to be used when notifying the first remote terminal of the link problem based on the identifier of the first remote terminal in the first message.

[0403] It should be noted that the above description refers to transmitting information about a link problem to the first remote terminal. Furthermore, to prevent the target communication peer of the first remote terminal from still sending data to the first remote terminal despite a link problem, optionally, in this embodiment, it is also necessary to notify the target communication peer of the first remote terminal of the link problem. In some embodiments, in one implementation, the third relay terminal sends a third message to the target communication peer of the first remote terminal on the multi-hop relay link.

[0404] It should be noted that the third message mentioned in this embodiment can be understood as a message from the third relay terminal to the next-hop node in the first transmission direction reporting a problem with the multi-hop relay link. Upon receiving the third message, the next-hop node of the third relay terminal will know that a problem has occurred in the multi-hop relay link.

[0405] In some embodiments, the third message includes third information, which includes at least one of the following:

[0406] E11, Identifier of the first remote terminal;

[0407] E12, Local identifier of the first remote terminal;

[0408] E13, Identification of the second remote terminal;

[0409] E14, Multi-hop path identification information;

[0410] E15, Hop count identification information in the first transmission direction;

[0411] E16, a combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0412] E17. Terminal identification information assigned by the network device to the first remote terminal;

[0413] E18, Transmission direction indication information;

[0414] It should be noted that the transmission direction indication information can notify the target communication peer of which specific transmission direction has a problem. This transmission direction indication information can be used to indicate the transmission direction from the first remote terminal to the target communication peer or the transmission direction from the target communication peer to the first remote terminal.

[0415] E19, Type Indication Information;

[0416] In some embodiments, this type indication information is used to indicate the type of problem that occurred in a multi-hop relay link.

[0417] In some embodiments, when the target communication peer of the first remote terminal is a network device, the third information includes at least one of E11-E12 and E14-E18; when the target communication peer of the first remote terminal is a second remote terminal, the third information includes at least one of E11-E16 and E18.

[0418] It should be noted that by sending a third message to the next-hop node in the first transmission direction from the third relay terminal to notify the next-hop node of the link problem, it is possible to ensure timely communication processing when the link of the relay terminal fails in a multi-hop relay scenario, thereby reducing communication interruption time and improving user experience.

[0419] In some embodiments, in one implementation, sending a third message to the target communication peer of the first remote terminal on the multi-hop relay link includes:

[0420] If the second condition is met, a third message is sent to the target communication peer of the first remote terminal on the multi-hop relay link.

[0421] The second condition includes at least one of the following:

[0422] E21, A Relay Fault (RLF) occurs at the direct communication interface between the first relay terminal and the third relay terminal;

[0423] E22, Received the instruction information sent by the first relay terminal;

[0424] In other words, in this situation, the first relay terminal needs to send indication information to the third relay terminal. In some embodiments, the indication information is used to indicate at least one of the following:

[0425] The first relay terminal has been switched over;

[0426] The first relay terminal experienced cell reselection;

[0427] The first relay terminal experienced an RLF on the Uu interface;

[0428] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0429] RRC reconfiguration between the first relay terminal and the network device failed;

[0430] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0431] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0432] E23, the direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0433] It should be noted that if any of E21-E23 occurs, it indicates a problem with the multi-hop relay link, and the first remote terminal will be unable to communicate normally with the other end.

[0434] In some embodiments, when the first relay terminals E21 and E23 determine that a link problem has occurred, the third relay terminal can also be aware of this situation at the same time. However, if the first relay terminal has other problems, the third relay terminal needs to receive the indication information sent by the first relay terminal.

[0435] In some embodiments, the third message may also include at least one of the following:

[0436] The identifier of the first relay terminal;

[0437] The identifier of the third relay terminal.

[0438] In some embodiments, where the multi-hop trunk link is a terminal-to-network device multi-hop trunk link, the type indication information in the third information is used to indicate any of the following:

[0439] F11, The direct communication interface of the third relay terminal experiences an RLF;

[0440] In some embodiments, an RLF (Redirect Communication Failure) occurring on the direct communication interface of the third relay terminal specifically refers to an RLF occurring on the direct communication interface between the third relay terminal and the first relay terminal.

[0441] F12, the first relay terminal has been switched;

[0442] F13, Cell reselection occurs at the first relay terminal;

[0443] F14. The first relay terminal experiences an RLF on the Uu interface;

[0444] F15. The end-to-end RRC connection between the first relay terminal and the network device failed to be established.

[0445] F16. RRC reconfiguration between the first relay terminal and the network device failed;

[0446] F17. The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0447] Specifically, F12 to F17 are determined by the third relay terminal based on the instruction information received from the first relay terminal.

[0448] The direct communication interface between F18 and the third relay terminal failed to reconfigure via RRC.

[0449] In some embodiments, the failure of RRC reconfiguration of the direct communication interface between the third relay terminals specifically refers to the failure of RRC reconfiguration of the direct communication interface between the third relay terminal and the first relay terminal.

[0450] In some embodiments, where the multi-hop trunk link is an end-to-end multi-hop trunk link, the type indication information in the third information is used to indicate any of the following:

[0451] F21, The direct communication interface of the third relay terminal experiences an RLF (Redirect Frequency Error).

[0452] In some embodiments, an RLF (Redirect Communication Failure) occurring on the direct communication interface of the third relay terminal specifically refers to an RLF occurring on the direct communication interface between the third relay terminal and the first relay terminal.

[0453] F22. The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0454] F23, End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0455] Specifically, F22 to F23 are determined by the third relay terminal based on the instruction information received from the first relay terminal.

[0456] F24, the direct communication interface between the third relay terminal and the third relay terminal failed to reconfigure via RRC.

[0457] In some embodiments, the failure of RRC reconfiguration of the direct communication interface between the third relay terminals specifically refers to the failure of RRC reconfiguration of the direct communication interface between the third relay terminal and the first relay terminal.

[0458] In some embodiments, if the target communication peer of the first remote terminal is a network device, the network device may perform at least one of the following operations after receiving the third message:

[0459] H11. Send an end-to-end RRC reconfiguration message to at least one relay terminal on the multi-hop relay link to notify the relay terminal to release the adaptation layer configuration information corresponding to the remote terminal (including but not limited to the local identifier of the first remote terminal, the local identifier of the first remote terminal in each relay terminal, and the egress radio link control channel (Egress RLC channel) corresponding to the end-to-end radio bearer).

[0460] H12, Suspend downlink data transmission from the first remote terminal.

[0461] In some embodiments, if the target communication peer of the first remote terminal is the second remote terminal, the second remote terminal may perform at least one of the following operations after receiving the third message:

[0462] H21, Community Measurement;

[0463] H22 and U2N relay terminals transmit;

[0464] H23 and U2U relay terminals were detected.

[0465] H24, Single-hop U2N trunk terminal reselection;

[0466] H25, Multi-hop U2N trunk terminal reselection;

[0467] H26, Single-hop U2U trunk terminal reselection;

[0468] H27, Multi-hop U2U trunk terminal reselection.

[0469] The specific applications of the embodiments of this disclosure are illustrated below with examples.

[0470] Application Scenario 1: U2N Multi-Hop Relay Scenarios

[0471] For ease of description, this application scenario is based on Figure 4 as an example. In Figure 4, the first remote terminal and the network device need to communicate through three relay terminals.

[0472] As shown in Figure 5, the main implementations of this application include:

[0473] Step S51: The first relay terminal determines whether the first condition is met;

[0474] That is, the first relay terminal determines whether there is a problem with the multi-hop relay link.

[0475] Specifically, the first condition includes at least one of the following:

[0476] The direct communication interface between the first relay terminal and the third relay terminal experienced an RLF (Redirect Flow Error).

[0477] The first relay terminal has been switched over;

[0478] The first relay terminal experienced cell reselection;

[0479] The first relay terminal experienced an RLF on the Uu interface;

[0480] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0481] RRC reconfiguration between the first relay terminal and the network device failed;

[0482] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0483] Once the first relay terminal determines that there is a problem with the multi-hop relay link, it executes step S52.

[0484] Step S52: The first relay terminal sends a first message to the second relay terminal;

[0485] Specifically, the first message contains at least one piece of first information, the content of which includes at least one of the following:

[0486] The identifier of the first remote terminal;

[0487] The local identifier of the first remote terminal;

[0488] Multi-hop path identification information;

[0489] Hop count identification information on multi-hop transmission paths;

[0490] The combination of the first remote terminal identifier and the network device identifier;

[0491] The network device to which the first remote terminal accesses assigns it terminal identification information.

[0492] Optionally, the first message may also include second information, the content of which includes at least one of the following:

[0493] The identifier of the first relay terminal;

[0494] The identifier of the third relay terminal;

[0495] Type indication information.

[0496] The type indication information is used to indicate at least one of the following:

[0497] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0498] The first relay terminal has been switched over;

[0499] The first relay terminal experienced cell reselection;

[0500] The first relay terminal experienced an RLF on the Uu interface;

[0501] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0502] RRC reconfiguration between the first relay terminal and the network device failed;

[0503] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0504] In some embodiments, the first message may be RRC signaling and / or a Medium Access Control Control Element (MAC CE). If RRC signaling is used, it may be a Direct Communication Interface Notification Message (NotificationMessageSidelink) or other newly introduced RRC messages.

[0505] Step S53: When the second relay terminal determines that it needs to send a second message to the next hop node, it sends a second message to the first remote terminal.

[0506] In this step, the second relay terminal receives the first message and determines whether to send a second message to the previous hop node in the first transmission direction (in this application scenario, the previous hop node is the first remote terminal) based on the first information contained in the first message.

[0507] In some embodiments, the second message satisfies at least one of the following:

[0508] The second message includes the first information, that is, the second relay terminal directly forwards the received first message to the first remote terminal.

[0509] The second message does not include the first information, that is, when the second relay terminal forwards the first message to the first remote terminal, the first information contained in the first message can be deleted.

[0510] In some embodiments, the second message may be RRC signaling and / or MAC CE. If RRC signaling is used, it may be NotificationMessageSidelink, or other newly introduced RRC messages.

[0511] Step S54: The first remote terminal performs the relevant operations;

[0512] Specifically, the relevant operations performed by the first remote terminal include, but are not limited to, at least one of the following:

[0513] Community surveying;

[0514] U2N relay terminal transmission;

[0515] U2U relay terminal detected;

[0516] Single-hop U2N trunk terminal reselection;

[0517] Multi-hop U2N trunk terminal reselection;

[0518] Single-hop U2U trunk terminal reselection;

[0519] Multi-hop U2U relay terminal reselection.

[0520] Step S55: The first relay terminal sends indication information to the third relay terminal, the indication information being used to indicate at least one of the following:

[0521] The first relay terminal has been switched over;

[0522] The first relay terminal experienced cell reselection;

[0523] The first relay terminal experienced an RLF on the Uu interface;

[0524] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0525] RRC reconfiguration between the first relay terminal and the network device failed.

[0526] It should be noted that this step is optional. Step S55 can be executed after step S52, and there is no strict time order requirement between it and steps S53 and S54.

[0527] For example, when the first relay terminal experiences cell reselection, it sends an indication message to the third relay terminal through the direct communication interface.

[0528] Step S56: The third relay terminal sends a third message to the network device.

[0529] In some embodiments, this step is optional.

[0530] In some embodiments, if the third relay terminal and the network device have a direct Uu interface, RRC messages are sent via the Uu interface; if the third relay terminal and the network device do not have a direct Uu interface, end-to-end RRC signaling can be sent between the third relay terminal and the network device. The RRC signaling can be UEInformationSidelink (UES) from related technologies, or other RRC messages.

[0531] In some embodiments, the third message includes third information, which includes at least one of the following:

[0532] Transmission direction indication information;

[0533] The identifier of the first remote terminal;

[0534] The local identifier of the first remote terminal;

[0535] Multi-hop path identification information;

[0536] Hop number identification information on the multi-hop transmission path; terminal identifier (e.g., C-RNTI) assigned to the first remote terminal by the network device it accesses;

[0537] Type indication information.

[0538] This type of indication information is used to indicate at least one of the following:

[0539] The third relay terminal sends an RLF via its direct communication interface;

[0540] The first relay terminal has been switched over;

[0541] The first relay terminal experienced cell reselection;

[0542] The first relay terminal experienced an RLF on the Uu interface;

[0543] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0544] RRC reconfiguration between the first relay terminal and the network device failed;

[0545] The direct communication interface RRC reconfiguration of the third relay terminal failed.

[0546] In some embodiments, the third message may further include at least one of the following: the identifier of the first relay terminal and the identifier of the third relay terminal.

[0547] Step S57: The network device performs the relevant operations.

[0548] It should be noted that this step is optional.

[0549] Specifically, the operations performed by network devices may include at least one of the following:

[0550] Send an end-to-end RRC reconfiguration message to at least one relay terminal on the multi-hop relay link to notify the relay terminal to release the adaptation layer configuration information corresponding to the remote terminal (including but not limited to the local identifier of the remote terminal, the local identifier of the remote terminal in the relay terminal, and the Egress RLC channel corresponding to the end-to-end radio bearer, etc.).

[0551] Suspend downlink data transmission to the remote terminal.

[0552] Application Scenario 2: U2U Multi-Hop Relay Scenarios

[0553] For ease of description, this application scenario is based on Figure 6 as an example. In Figure 6, the first remote terminal and the second remote terminal need to communicate through three relay terminals.

[0554] As shown in Figure 7, the main implementations of this application include:

[0555] Step S71: The first relay terminal determines whether the first condition is met;

[0556] That is, the first relay terminal determines whether there is a problem with the multi-hop relay link.

[0557] Specifically, the first condition includes at least one of the following:

[0558] The direct communication interface between the first relay terminal and the third relay terminal experienced an RLF (Redirect Flow Error).

[0559] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0560] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0561] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0562] Once the first relay terminal determines that there is a problem with the multi-hop relay link, it executes step S72.

[0563] Step S72: The first relay terminal sends a first message to the second relay terminal;

[0564] Specifically, the first message contains at least one piece of first information, the content of which includes at least one of the following:

[0565] The identifier of the first remote terminal;

[0566] The local identifier of the first remote terminal;

[0567] Multi-hop path identification information;

[0568] Hop count identification information on multi-hop transmission paths;

[0569] A combination of the identifier of the first remote terminal and the identifier of the second remote terminal.

[0570] Optionally, the first message may also include second information, the content of which includes at least one of the following:

[0571] The identifier of the first relay terminal;

[0572] The identifier of the third relay terminal;

[0573] Type indication information.

[0574] The type indication information is used to indicate at least one of the following:

[0575] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0576] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0577] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0578] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0579] The first message can be RRC signaling and / or MAC CE. If RRC signaling is used, it can be NotificationMessageSidelink, or other newly introduced RRC messages.

[0580] Step S73: When the second relay terminal determines that it needs to send a second message to the next hop node, it sends a second message to the first remote terminal.

[0581] In this step, the second relay terminal receives the first message and determines whether to send a second message to the previous hop node in the first transmission direction (in this application scenario, the previous hop node is the first remote terminal) based on the first information contained in the first message.

[0582] In some embodiments, the second message satisfies at least one of the following:

[0583] The second message includes the first information, that is, the second relay terminal directly forwards the received first message to the first remote terminal.

[0584] The second message does not include the first information, that is, when the second relay terminal forwards the first message to the first remote terminal, the first information contained in the first message can be deleted.

[0585] In some embodiments, the second message may be RRC signaling and / or MAC CE. If RRC signaling is used, it may be NotificationMessageSidelink, or other newly introduced RRC messages.

[0586] Step S74: The first remote terminal performs the relevant operations.

[0587] Specifically, the relevant operations performed by the first remote terminal include, but are not limited to, at least one of the following:

[0588] Community surveying;

[0589] U2N relay terminal transmission;

[0590] U2U relay terminal detected;

[0591] Single-hop U2N trunk terminal reselection;

[0592] Multi-hop U2N trunk terminal reselection;

[0593] Single-hop U2U trunk terminal reselection;

[0594] Multi-hop U2U relay terminal reselection.

[0595] Step S75: The third relay terminal determines whether the second condition is met;

[0596] That is, the third relay terminal determines whether there is a problem with the multi-hop relay link.

[0597] In some embodiments, the second condition includes at least one of the following:

[0598] The direct communication interface between the first relay terminal and the third relay terminal experienced an RLF (Redirect Flow Error).

[0599] Received the instruction information sent by the first relay terminal;

[0600] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0601] In some embodiments, the indication information is used to indicate at least one of the following:

[0602] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0603] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0604] Once the third relay terminal determines that there is a problem with the multi-hop relay link, it executes step S76.

[0605] Step S76: The third relay terminal sends a third message to the second remote terminal;

[0606] It should be noted that this step is optional.

[0607] The third message includes third information, which includes at least one of the following:

[0608] The identifier of the first remote terminal;

[0609] The local identifier of the first remote terminal;

[0610] The identifier of the second remote terminal;

[0611] Multi-hop path identification information;

[0612] Hop count identification information in the first transmission direction;

[0613] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0614] Transmission direction indication information;

[0615] Type indication information.

[0616] This type of indication information is used to indicate at least one of the following:

[0617] The direct communication interface of the third relay terminal experienced an RLF (Redirect Flow Error).

[0618] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0619] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed;

[0620] The direct communication interface RRC reconfiguration of the third relay terminal failed.

[0621] In some embodiments, the third message may further include at least one of the following: the identifier of the first relay terminal and the identifier of the third relay terminal.

[0622] Step S77: The second remote terminal performs the relevant operations.

[0623] It should be noted that this step is optional.

[0624] Specifically, the relevant operations performed by the second remote terminal include, but are not limited to, at least one of the following:

[0625] Community surveying;

[0626] U2N relay terminal transmission;

[0627] U2U relay terminal detected;

[0628] Single-hop U2N trunk terminal reselection;

[0629] Multi-hop U2N trunk terminal reselection;

[0630] Single-hop U2U trunk terminal reselection;

[0631] Multi-hop U2U relay terminal reselection.

[0632] It should be noted that at least one embodiment of this disclosure provides a relay link management method in a multi-hop relay scenario, which can ensure that the system can work normally when one hop of a multi-hop relay link has a link problem.

[0633] The technical solutions provided in this disclosure are applicable to a variety of systems, especially 5G systems. For example, applicable systems may include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), 5G New Radio (NR) and its evolutionary communication systems, and 6th Generation (6G) systems. All of these systems include terminals (also referred to as terminal equipment) and network equipment. The system may also include a core network component, such as an evolved packet system (EPS) or a 5G system (5GS).

[0634] The terminal involved in the embodiments of this disclosure, also referred to as a terminal device, can be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connectivity, or other processing devices connected to a wireless modem. The name of the terminal device may differ in different systems; for example, in a 5G system, the terminal device can be called User Equipment (UE). The wireless terminal device can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device, for example, a portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile device, which exchanges voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but is not limited to these terms in the embodiments disclosed herein.

[0635] The network device disclosed in this embodiment may be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, the base station may also be called an access point, or a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network equipment involved in this disclosure can be a base transceiver station (BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA) system, a NodeB in a wide-band Code Division Multiple Access (WCDMA) system, an evolved Node B (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in this disclosure. In some network structures, the network equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may be geographically separated.

[0636] Network devices and terminal devices can each use one or more antennas for Multiple Input Multiple Output (MIMO) transmission. MIMO transmission can be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D MIMO, 3D MIMO, Full Dimension MIMO (FD-MIMO), or Massive MIMO, or it can be diversity transmission, pre-coded transmission, or beamforming transmission, etc.

[0637] As shown in Figure 8, this embodiment of the present disclosure provides an information transmission method, executed by a target device, including:

[0638] Step S801: Receive the first message sent by the first relay terminal on the multi-hop relay link;

[0639] The first message includes first information, which includes at least one of the following:

[0640] The identifier of the first remote terminal;

[0641] The local identifier of the first remote terminal;

[0642] The identifier of the second remote terminal;

[0643] Multi-hop path identification information;

[0644] Hop count identification information in the first transmission direction;

[0645] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0646] The network device assigns terminal identification information to the first remote terminal;

[0647] Wherein, the first remote terminal is the first terminal in the first transmission direction, the target communication peer of the first remote terminal is the second remote terminal or network device, the target device is the previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or the second relay terminal.

[0648] The first transmission direction includes one of the following:

[0649] The transmission direction from the first remote terminal to the network device;

[0650] Uplink transmission direction;

[0651] The transmission direction from the first remote terminal to the second remote terminal.

[0652] In some embodiments, when the target device is a second relay terminal, the method further includes:

[0653] Based on the first message, determine whether to send a second message to the previous hop node of the target device in the first transmission direction;

[0654] Wherein, if the previous hop node of the target device in the first transmission direction is a relay terminal, the second message includes the first information.

[0655] In some embodiments, the multi-hop relay link includes: a terminal-to-network device multi-hop relay link and / or a terminal-to-terminal multi-hop relay link; the first message further includes second information, the second information including at least one of the following:

[0656] The identifier of the first relay terminal;

[0657] The identifier of the third relay terminal, wherein the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0658] Type indication information.

[0659] In some embodiments, when the multi-hop trunk link is a terminal-to-network device multi-hop trunk link, the type indication information is used to indicate any of the following:

[0660] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0661] The first relay terminal has been switched over;

[0662] The first relay terminal experienced cell reselection;

[0663] The first relay terminal experienced an RLF on the Uu interface;

[0664] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0665] RRC reconfiguration between the first relay terminal and the network device failed;

[0666] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0667] In some embodiments, where the multi-hop trunk link is an end-to-end multi-hop trunk link, the type indication information is used to indicate any of the following:

[0668] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0669] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0670] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0671] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0672] It should be noted that all the implementation methods in the above embodiments are applicable to the embodiments of the information transmission method applied to the target device side, and can achieve the same technical effect, so they will not be described again here.

[0673] As shown in Figure 9, this embodiment of the present disclosure provides an information transmission method, executed by a third relay terminal, including:

[0674] Step S901: Send a third message to the target communication peer of the first remote terminal on the multi-hop relay link. The target communication peer of the first remote terminal is a second remote terminal or a network device.

[0675] The third message includes third information, which includes at least one of the following:

[0676] The identifier of the first remote terminal;

[0677] The local identifier of the first remote terminal;

[0678] The identifier of the second remote terminal, which is the communication peer of the first remote terminal;

[0679] Multi-hop path identification information;

[0680] Hop count identification information in the first transmission direction;

[0681] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0682] The network device assigns terminal identification information to the first remote terminal;

[0683] Transmission direction indication information;

[0684] Type indication information;

[0685] Wherein, the first remote terminal is the first terminal in the first transmission direction; the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0686] The first transmission direction includes one of the following:

[0687] The transmission direction from the first remote terminal to the network device;

[0688] Uplink transmission direction;

[0689] The transmission direction from the first remote terminal to the second remote terminal.

[0690] In some embodiments, sending a third message to the target communication peer of the first remote terminal on the multi-hop relay link includes:

[0691] If the second condition is met, a third message is sent to the target communication peer of the first remote terminal on the multi-hop relay link.

[0692] The second condition includes at least one of the following:

[0693] A radio link failure (RLF) occurred at the direct communication interface between the first relay terminal and the third relay terminal.

[0694] Received the instruction information sent by the first relay terminal;

[0695] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0696] The indication information is used to indicate at least one of the following:

[0697] The first relay terminal has been switched over;

[0698] The first relay terminal experienced cell reselection;

[0699] The first relay terminal experienced an RLF on the Uu interface;

[0700] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0701] RRC reconfiguration between the first relay terminal and the network device failed;

[0702] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0703] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0704] It should be noted that all the implementation methods in the above embodiments are applicable to the embodiments of the information transmission method applied to the third relay terminal side, and can achieve the same technical effect, so they will not be described again here.

[0705] As shown in Figure 10, this embodiment of the present disclosure provides an information transmission device 1000, applied to a first relay terminal, comprising:

[0706] The first sending unit 1001 is used to send a first message to the target device on the multi-hop relay link;

[0707] The first message includes first information, which includes at least one of the following:

[0708] The identifier of the first remote terminal;

[0709] The local identifier of the first remote terminal;

[0710] The identifier of the second remote terminal;

[0711] Multi-hop path identification information;

[0712] Hop count identification information in the first transmission direction;

[0713] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0714] The network device assigns terminal identification information to the first remote terminal;

[0715] Wherein, the first remote terminal is the first terminal in the first transmission direction, and the target communication peer of the first remote terminal is the second remote terminal or a network device; the target device is the previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or the second relay terminal.

[0716] The first transmission direction includes one of the following:

[0717] The transmission direction from the first remote terminal to the network device;

[0718] Uplink transmission direction;

[0719] The transmission direction from the first remote terminal to the second remote terminal.

[0720] In some embodiments, the first transmitting unit 1001 is configured to:

[0721] If the first condition is met, a first message is sent to the target device on the multi-hop relay link, wherein the first condition includes at least one of the following:

[0722] A radio link failure (RLF) occurred at the direct communication interface between the first relay terminal and the third relay terminal.

[0723] The first relay terminal has been switched over;

[0724] The first relay terminal experienced cell reselection;

[0725] The first relay terminal experienced an RLF on the Uu interface;

[0726] The end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device failed to be established;

[0727] RRC reconfiguration between the first relay terminal and the network device failed;

[0728] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0729] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0730] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed;

[0731] The third relay terminal is the next-hop node of the first relay terminal in the first transmission direction; the multi-hop relay link includes: a multi-hop relay link from the terminal to the network device and / or a multi-hop relay link from the terminal to the terminal.

[0732] In some embodiments, the apparatus further includes:

[0733] The third transmitting unit is configured to transmit indication information to the third relay terminal, the indication information indicating at least one of the following:

[0734] The first relay terminal has been switched over;

[0735] The first relay terminal experienced cell reselection;

[0736] The first relay terminal experienced an RLF on the Uu interface;

[0737] The end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device failed to be established;

[0738] RRC reconfiguration between the first relay terminal and the network device failed;

[0739] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0740] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed;

[0741] The third relay terminal is the next-hop node of the first relay terminal in the first transmission direction.

[0742] In some embodiments, the first message further includes second information, which includes at least one of the following:

[0743] The identifier of the first relay terminal;

[0744] The identifier of the third relay terminal, wherein the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0745] Type indication information.

[0746] In some embodiments, when the multi-hop trunk link is a terminal-to-network device multi-hop trunk link, the type indication information is used to indicate any of the following:

[0747] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0748] The first relay terminal has been switched over;

[0749] The first relay terminal experienced cell reselection;

[0750] The first relay terminal experienced an RLF on the Uu interface;

[0751] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0752] RRC reconfiguration between the first relay terminal and the network device failed;

[0753] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0754] In some embodiments, where the multi-hop trunk link is an end-to-end multi-hop trunk link, the type indication information is used to indicate any of the following:

[0755] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0756] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0757] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0758] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0759] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0760] It should be noted that the division of units in the embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0761] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0762] As shown in Figure 11, this embodiment of the present disclosure also provides a relay terminal, which is a first relay terminal, including a processor 1100, a transceiver 1110, a memory 1120, and a program stored in the memory 1120 and executable on the processor 1100; wherein the transceiver 1110 is connected to the processor 1100 and the memory 1120 via a bus interface, and the processor 1100 is used to read the program in the memory and execute the following processes:

[0763] Send the first message to the target device on the multi-hop relay link;

[0764] The first message includes first information, which includes at least one of the following:

[0765] The identifier of the first remote terminal;

[0766] The local identifier of the first remote terminal;

[0767] The identifier of the second remote terminal;

[0768] Multi-hop path identification information;

[0769] Hop count identification information in the first transmission direction;

[0770] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0771] The network device assigns terminal identification information to the first remote terminal;

[0772] Wherein, the first remote terminal is the first terminal in the first transmission direction, and the target communication peer of the first remote terminal is the second remote terminal or a network device; the target device is the previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or the second relay terminal.

[0773] The first transmission direction includes one of the following:

[0774] The transmission direction from the first remote terminal to the network device;

[0775] Uplink transmission direction;

[0776] The transmission direction from the first remote terminal to the second remote terminal.

[0777] Transceiver 1110 is used to receive and send data under the control of processor 1100.

[0778] In Figure 11, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 1100 and memory represented by memory 1120. The bus architecture may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. Transceiver 1110 may be multiple components, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, etc. For different user equipment, user interface 1130 may also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0779] The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 can store the data used by the processor 1100 when performing operations.

[0780] Optionally, the processor 1100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may also adopt a multi-core architecture.

[0781] The processor executes any of the methods described in the embodiments of this disclosure by invoking a computer program stored in memory, according to the obtained executable instructions. The processor and memory may also be physically separated.

[0782] In some embodiments, the processor is configured to read a computer program from the memory and perform the following operations:

[0783] If the first condition is met, a first message is sent to the target device on the multi-hop relay link, wherein the first condition includes at least one of the following:

[0784] A radio link failure (RLF) occurred at the direct communication interface between the first relay terminal and the third relay terminal.

[0785] The first relay terminal has been switched over;

[0786] The first relay terminal experienced cell reselection;

[0787] The first relay terminal experienced an RLF on the Uu interface;

[0788] The end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device failed to be established;

[0789] RRC reconfiguration between the first relay terminal and the network device failed;

[0790] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0791] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0792] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed;

[0793] The third relay terminal is the next-hop node of the first relay terminal in the first transmission direction; the multi-hop relay link includes: a multi-hop relay link from the terminal to the network device and / or a multi-hop relay link from the terminal to the terminal.

[0794] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0795] Send indication information to the third relay terminal, the indication information being used to indicate at least one of the following:

[0796] The first relay terminal has been switched over;

[0797] The first relay terminal experienced cell reselection;

[0798] The first relay terminal experienced an RLF on the Uu interface;

[0799] The end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device failed to be established;

[0800] RRC reconfiguration between the first relay terminal and the network device failed;

[0801] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0802] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed;

[0803] The third relay terminal is the next-hop node of the first relay terminal in the first transmission direction.

[0804] In some embodiments, the first message further includes second information, which includes at least one of the following:

[0805] The identifier of the first relay terminal;

[0806] The identifier of the third relay terminal, wherein the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0807] Type indication information.

[0808] In some embodiments, when the multi-hop trunk link is a terminal-to-network device multi-hop trunk link, the type indication information is used to indicate any of the following:

[0809] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0810] The first relay terminal has been switched over;

[0811] The first relay terminal experienced cell reselection;

[0812] The first relay terminal experienced an RLF on the Uu interface;

[0813] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0814] RRC reconfiguration between the first relay terminal and the network device failed;

[0815] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0816] In some embodiments, where the multi-hop trunk link is an end-to-end multi-hop trunk link, the type indication information is used to indicate any of the following:

[0817] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0818] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0819] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0820] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0821] It should be noted that the information transmission device provided in this embodiment can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0822] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of an information transmission method applied to a first relay terminal. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., compact disc (CD), digital video disc (DVD), Blu-ray disc (BD), high-definition versatile disc (HVD), etc.), and semiconductor storage (e.g., ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), non-volatile memory (NAND (Non-volatile Memory Device) FLASH), solid-state drives (SSDs), etc.).

[0823] As shown in Figure 12, this embodiment of the present disclosure provides an information transmission device 1200, applied to a target device, comprising:

[0824] The first receiving unit 1201 is used to receive the first message sent by the first relay terminal on the multi-hop relay link;

[0825] The first message includes first information, which includes at least one of the following:

[0826] The identifier of the first remote terminal;

[0827] The local identifier of the first remote terminal;

[0828] The identifier of the second remote terminal;

[0829] Multi-hop path identification information;

[0830] Hop count identification information in the first transmission direction;

[0831] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0832] The network device assigns terminal identification information to the first remote terminal;

[0833] Wherein, the first remote terminal is the first terminal in the first transmission direction, the target communication peer of the first remote terminal is the second remote terminal or network device, the target device is the previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or the second relay terminal.

[0834] The first transmission direction includes one of the following:

[0835] The transmission direction from the first remote terminal to the network device;

[0836] Uplink transmission direction;

[0837] The transmission direction from the first remote terminal to the second remote terminal.

[0838] In some embodiments, when the target device is a second relay terminal, the apparatus further includes:

[0839] A determining unit is configured to determine, based on the first message, whether to send a second message to the previous hop node of the target device in the first transmission direction;

[0840] Wherein, if the previous hop node of the target device in the first transmission direction is a relay terminal, the second message includes the first information.

[0841] In some embodiments, the multi-hop relay link includes: a terminal-to-network device multi-hop relay link and / or a terminal-to-terminal multi-hop relay link; the first message further includes second information, the second information including at least one of the following:

[0842] The identifier of the first relay terminal;

[0843] The identifier of the third relay terminal, wherein the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0844] Type indication information.

[0845] In some embodiments, when the multi-hop trunk link is a terminal-to-network device multi-hop trunk link, the type indication information is used to indicate any of the following:

[0846] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0847] The first relay terminal has been switched over;

[0848] The first relay terminal experienced cell reselection;

[0849] The first relay terminal experienced an RLF on the Uu interface;

[0850] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0851] RRC reconfiguration between the first relay terminal and the network device failed;

[0852] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0853] In some embodiments, where the multi-hop trunk link is an end-to-end multi-hop trunk link, the type indication information is used to indicate any of the following:

[0854] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0855] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0856] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0857] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0858] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0859] It should be noted that the division of units in the embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0860] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0861] This disclosure also provides a target device, the structure of which is shown in Figure 11 and will not be described in detail here.

[0862] The processor is configured to read the computer program from the memory and perform the following operations:

[0863] Receive the first message sent by the first relay terminal on the multi-hop relay link;

[0864] The first message includes first information, which includes at least one of the following:

[0865] The identifier of the first remote terminal;

[0866] The local identifier of the first remote terminal;

[0867] The identifier of the second remote terminal;

[0868] Multi-hop path identification information;

[0869] Hop count identification information in the first transmission direction;

[0870] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0871] The network device assigns terminal identification information to the first remote terminal;

[0872] Wherein, the first remote terminal is the first terminal in the first transmission direction, the target communication peer of the first remote terminal is the second remote terminal or network device, the target device is the previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or the second relay terminal.

[0873] The first transmission direction includes one of the following:

[0874] The transmission direction from the first remote terminal to the network device;

[0875] Uplink transmission direction;

[0876] The transmission direction from the first remote terminal to the second remote terminal.

[0877] In some embodiments, when the target device is a second relay terminal, the processor, for reading the computer program in the memory, also performs the following operations:

[0878] Based on the first message, determine whether to send a second message to the previous hop node of the target device in the first transmission direction;

[0879] Wherein, if the previous hop node of the target device in the first transmission direction is a relay terminal, the second message includes the first information.

[0880] In some embodiments, the multi-hop relay link includes: a terminal-to-network device multi-hop relay link and / or a terminal-to-terminal multi-hop relay link; the first message further includes second information, the second information including at least one of the following:

[0881] The identifier of the first relay terminal;

[0882] The identifier of the third relay terminal, wherein the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0883] Type indication information.

[0884] In some embodiments, when the multi-hop trunk link is a terminal-to-network device multi-hop trunk link, the type indication information is used to indicate any of the following:

[0885] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0886] The first relay terminal has been switched over;

[0887] The first relay terminal experienced cell reselection;

[0888] The first relay terminal experienced an RLF on the Uu interface;

[0889] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0890] RRC reconfiguration between the first relay terminal and the network device failed;

[0891] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0892] In some embodiments, where the multi-hop trunk link is an end-to-end multi-hop trunk link, the type indication information is used to indicate any of the following:

[0893] The direct communication interface of the first relay terminal experienced an RLF (Redirect Message Failure).

[0894] The direct communication interface RRC reconfiguration of the first relay terminal failed.

[0895] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0896] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0897] It should be noted that the target device provided in this embodiment can implement all the method steps implemented in the above method embodiment and achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0898] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of an information transmission method applied to a target device. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs)).

[0899] As shown in Figure 13, this embodiment of the present disclosure provides an information transmission device 1300, applied to a third relay terminal, comprising:

[0900] The second sending unit 1301 is used to send a third message to the target communication peer of the first remote terminal on the multi-hop relay link, wherein the target communication peer of the first remote terminal is the second remote terminal or a network device.

[0901] The third message includes third information, which includes at least one of the following:

[0902] The identifier of the first remote terminal;

[0903] The local identifier of the first remote terminal;

[0904] The identifier of the second remote terminal, which is the communication peer of the first remote terminal;

[0905] Multi-hop path identification information;

[0906] Hop count identification information in the first transmission direction;

[0907] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0908] The network device assigns terminal identification information to the first remote terminal;

[0909] Transmission direction indication information;

[0910] Type indication information;

[0911] Wherein, the first remote terminal is the first terminal in the first transmission direction; the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0912] The first transmission direction includes one of the following:

[0913] The transmission direction from the first remote terminal to the network device;

[0914] Uplink transmission direction;

[0915] The transmission direction from the first remote terminal to the second remote terminal.

[0916] In some embodiments, the second transmitting unit 1301 is configured to:

[0917] If the second condition is met, a third message is sent to the target communication peer of the first remote terminal on the multi-hop relay link.

[0918] The second condition includes at least one of the following:

[0919] A radio link failure (RLF) occurred at the direct communication interface between the first relay terminal and the third relay terminal.

[0920] Received the instruction information sent by the first relay terminal;

[0921] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0922] The indication information is used to indicate at least one of the following:

[0923] The first relay terminal has been switched over;

[0924] The first relay terminal experienced cell reselection;

[0925] The first relay terminal experienced an RLF on the Uu interface;

[0926] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0927] RRC reconfiguration between the first relay terminal and the network device failed;

[0928] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0929] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0930] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0931] It should be noted that the division of units in the embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0932] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0933] This disclosure also provides a relay terminal, which is a third relay terminal. The structure of the third relay terminal is shown in Figure 11, and will not be described again here.

[0934] The processor is configured to read the computer program from the memory and perform the following operations:

[0935] Send a third message to the target communication peer of the first remote terminal on the multi-hop relay link, wherein the target communication peer of the first remote terminal is a second remote terminal or a network device.

[0936] The third message includes third information, which includes at least one of the following:

[0937] The identifier of the first remote terminal;

[0938] The local identifier of the first remote terminal;

[0939] The identifier of the second remote terminal, which is the communication peer of the first remote terminal;

[0940] Multi-hop path identification information;

[0941] Hop count identification information in the first transmission direction;

[0942] The combination of the identifier of the first remote terminal and the identifier of the target communication peer of the first remote terminal;

[0943] The network device assigns terminal identification information to the first remote terminal;

[0944] Transmission direction indication information;

[0945] Type indication information;

[0946] Wherein, the first remote terminal is the first terminal in the first transmission direction; the third relay terminal is the next hop node of the first relay terminal in the first transmission direction;

[0947] The first transmission direction includes one of the following:

[0948] The transmission direction from the first remote terminal to the network device;

[0949] Uplink transmission direction;

[0950] The transmission direction from the first remote terminal to the second remote terminal.

[0951] In some embodiments, the processor is configured to read a computer program from the memory and perform the following operations:

[0952] If the second condition is met, a third message is sent to the target communication peer of the first remote terminal on the multi-hop relay link.

[0953] The second condition includes at least one of the following:

[0954] A radio link failure (RLF) occurred at the direct communication interface between the first relay terminal and the third relay terminal.

[0955] Received the instruction information sent by the first relay terminal;

[0956] The direct communication interface RRC reconfiguration between the first relay terminal and the third relay terminal failed.

[0957] The indication information is used to indicate at least one of the following:

[0958] The first relay terminal has been switched over;

[0959] The first relay terminal experienced cell reselection;

[0960] The first relay terminal experienced an RLF on the Uu interface;

[0961] The end-to-end RRC connection between the first relay terminal and the network device failed to be established;

[0962] RRC reconfiguration between the first relay terminal and the network device failed;

[0963] The end-to-end RRC connection between the first relay terminal and the second remote terminal failed to be established;

[0964] End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal failed.

[0965] It should be noted that the third relay terminal provided in this embodiment will not be described in detail here, including the parts and beneficial effects that are the same as those in the method embodiment.

[0966] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of an information transmission method applied to a third relay terminal. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs)).

[0967] This disclosure also provides a computer program product, including computer instructions. When executed by a processor, these computer instructions implement the various processes in the above method embodiments and achieve the same technical effects. To avoid repetition, further details are omitted here.

[0968] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0969] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0970] These processor-executable instructions may also be stored in a processor-readable memory that can instruct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0971] These processor-executable instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0972] Furthermore, it should be noted that in the apparatus and method of this disclosure, it is obvious that the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered equivalent solutions of this disclosure. Moreover, the steps performing the above series of processes can naturally be executed in the order described, but are not necessarily required to be executed in chronological order; some steps can be executed in parallel or independently of each other. Those skilled in the art will understand that all or any step or component of the method and apparatus of this disclosure can be implemented in any computing device (including processors, storage media, etc.) or network of computing devices, in hardware, firmware, software, or a combination thereof, which can be achieved by those skilled in the art using their basic programming skills after reading the description of this disclosure.

[0973] It should be noted that the above division of modules is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software via processing element calls; they can be fully implemented in hardware; or some modules can be implemented by processing element calls to software, while others are implemented in hardware. For example, a module can be a separate processing element, or it can be integrated into a chip in the aforementioned device. Alternatively, it can be stored as program code in the memory of the aforementioned device, and its function can be called and executed by a processing element of the device. The implementation of other modules is similar. Moreover, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element mentioned here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules can be completed through integrated logic circuits in the hardware of the processor element or through software instructions.

[0974] For example, each module, unit, subunit, or submodule can be one or more integrated circuits configured to implement the above methods, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs). As another example, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together to implement a system-on-a-chip (SOC).

[0975] The terms “first,” “second,” etc., used in this disclosure and in the claims are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this disclosure described herein may be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. Additionally, the use of “and / or” in the specification and claims indicates at least one of the connected objects, such as A and / or B and / or C, indicating seven possibilities: A alone, B alone, C alone, and both A and B, both B and C, both A and C, and A, B, and C. Similarly, the use of “at least one of A and B” in this specification and claims should be understood as “A alone, B alone, or both A and B.”

[0976] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. An information transmission method applied to a first relay terminal, the method comprising: if a first condition is met, sending a first message to a target device on a multi-hop relay link, the first condition comprising at least one of: a radio link failure (RLF) of a direct communication interface between the first relay terminal and a third relay terminal; a handover of the first relay terminal; a cell reselection of the first relay terminal; an RLF of a Uu interface of the first relay terminal; a failure of an end-to-end radio resource control (RRC) connection establishment between the first relay terminal and a network device; a failure of an RRC reconfiguration between the first relay terminal and the network device; a failure of an RRC reconfiguration of the direct communication interface between the first relay terminal and the third relay terminal; a failure of an end-to-end RRC connection establishment between the first relay terminal and a second remote terminal; a failure of an end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal; wherein the third relay terminal is a next-hop node of the first relay terminal in a first transmission direction, and the multi-hop relay link comprises a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal.

2. The method of claim 1, wherein, The method further comprises: sending, to the third relay terminal, indication information indicating at least one of: the handover of the first relay terminal; the cell reselection of the first relay terminal; the RLF of the Uu interface of the first relay terminal; the failure of the end-to-end RRC connection establishment between the first relay terminal and the network device; the failure of the RRC reconfiguration between the first relay terminal and the network device; the failure of the end-to-end RRC connection establishment between the first relay terminal and the second remote terminal; the failure of the end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal; wherein the third relay terminal is the next-hop node of the first relay terminal in the first transmission direction.

3. The method of claim 1, wherein, The first message further comprises second information comprising at least one of: an identifier of the first relay terminal; an identifier of the third relay terminal, which is the next-hop node of the first relay terminal in the first transmission direction; type indication information.

4. The method of claim 3, wherein, In a case where the multi-hop relay link is a multi-hop relay link from a terminal to a network device, the type indication information is used to indicate any one of: the RLF of the direct communication interface of the first relay terminal; the handover of the first relay terminal; the cell reselection of the first relay terminal; the RLF of the Uu interface of the first relay terminal; the failure of the end-to-end RRC connection establishment between the first relay terminal and the network device; the failure of the RRC reconfiguration between the first relay terminal and the network device; the failure of the RRC reconfiguration of the direct communication interface of the first relay terminal.

5. The method of claim 3, wherein, In a case where the multi-hop relay link is a multi-hop relay link from a terminal to a terminal, the type indication information is used to indicate any one of: the RLF of the direct communication interface of the first relay terminal; the failure of the RRC reconfiguration of the direct communication interface of the first relay terminal; the failure of the end-to-end RRC connection establishment between the first relay terminal and the second remote terminal; the failure of the end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal.

6. The method of claim 1, wherein, The first message includes first information, and the first information includes at least one of the following: an identifier of the first remote terminal; a local identifier of the first remote terminal; an identifier of the second remote terminal; multi-hop path identification information; hop count identification information in the first transmission direction; a combination of the identifier of the first remote terminal and an identifier of a target communication opposite end of the first remote terminal; terminal identification information allocated to the first remote terminal by the network device; wherein the first remote terminal is a first terminal in the first transmission direction, and the target communication opposite end of the first remote terminal is a second remote terminal or the network device; and the target device is a previous hop node of a first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal; the first transmission direction includes one of the following: a transmission direction from the first remote terminal to the network device; an uplink transmission direction; a transmission direction from the first remote terminal to the second remote terminal.

7. The method of claim 1, wherein, The first message is a direct communication interface notification message.

8. An information transmission method applied to a target device, the method comprising: receiving a first message sent by a first relay terminal on a multi-hop relay link; wherein the first remote terminal is a first terminal in the first transmission direction, and the target communication opposite end of the first remote terminal is a second remote terminal or the network device; and the target device is a previous hop node of a first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal; the first transmission direction includes one of the following: a transmission direction from the first remote terminal to the network device; an uplink transmission direction; a transmission direction from the first remote terminal to the second remote terminal.

9. The method of claim 8, wherein, In a case where the target device is the second relay terminal, the method further comprises: determining, according to the first message, whether to send a second message to a previous hop node of the target device in the first transmission direction; wherein in a case where the previous hop node of the target device in the first transmission direction is a relay terminal, the second message includes first information.

10. The method of claim 8 or 9, wherein, The multi-hop relay link includes a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal; and the first message further includes second information, and the second information includes at least one of the following: an identifier of the first relay terminal; an identifier of a third relay terminal, which is a next hop node of the first relay terminal in the first transmission direction; type indication information.

11. The method of claim 10, wherein, In a case where the multi-hop relay link is a multi-hop relay link from a terminal to a network device, the type indication information is used to indicate any one of the following: RLF of a direct communication interface of the first relay terminal; handover of the first relay terminal; cell reselection of the first relay terminal; RLF of a Uu interface of the first relay terminal; failure of end-to-end RRC connection establishment between the first relay terminal and the network device; RRC reconfiguration failure between the first relay terminal and the network device; RRC reconfiguration failure of a direct communication interface of the first relay terminal.

12. The method of claim 10, wherein, In the case that the multi-hop relay link is a terminal-to-terminal multi-hop relay link, the type indication information is used to indicate any of the following: RLF of the direct communication interface of the first relay terminal; RRC reconfiguration failure of the direct communication interface of the first relay terminal; End-to-end RRC connection establishment failure between the first relay terminal and the second remote terminal; End-to-end RRC reconfiguration failure between the first relay terminal and the second remote terminal.

13. The method of claim 8, wherein, The first message includes first information, and the first information includes at least one of the following: an identifier of the first remote terminal; a local identifier of the first remote terminal; an identifier of the second remote terminal; multi-hop path identification information; hop count identification information in a first transmission direction; a combination of an identifier of the first remote terminal and an identifier of a target communication opposite end of the first remote terminal; terminal identification information allocated to the first remote terminal by a network device.

14. The method of claim 8, wherein, The first message is a direct communication interface notification message.

15. An information transmission method applied to a third relay terminal, the method comprising: in the case that a second condition is met, sending a third message to a target communication opposite end of a first remote terminal on a multi-hop relay link; wherein the second condition includes at least one of the following: RLF of a direct communication interface between the first relay terminal and the third relay terminal; receiving indication information sent by the first relay terminal; RRC reconfiguration failure of the direct communication interface between the first relay terminal and the third relay terminal; wherein the indication information is used to indicate at least one of the following: handover of the first relay terminal; cell reselection of the first relay terminal; RLF of the first relay terminal on a Uu interface; end-to-end RRC connection establishment failure between the first relay terminal and a network device; RRC reconfiguration failure between the first relay terminal and the network device; end-to-end RRC connection establishment failure between the first relay terminal and a second remote terminal; end-to-end RRC reconfiguration failure between the first relay terminal and the second remote terminal.

16. The method of claim 15, wherein, the target communication opposite end of the first remote terminal is the second remote terminal or the network device; wherein the third message includes third information, and the third information includes at least one of the following: an identifier of the first remote terminal; a local identifier of the first remote terminal; an identifier of the second remote terminal, which is a communication opposite end of the first remote terminal; multi-hop path identification information; hop count identification information in a first transmission direction; a combination of an identifier of the first remote terminal and an identifier of a target communication opposite end of the first remote terminal; terminal identification information allocated to the first remote terminal by a network device; transmission direction indication information; type indication information; wherein the first remote terminal is a first terminal in a first transmission direction; and the third relay terminal is a next hop node of the first relay terminal in the first transmission direction; the first transmission direction includes one of the following: a transmission direction from the first remote terminal to the network device; an uplink transmission direction; a transmission direction from the first remote terminal to the second remote terminal.

17. A relay terminal, the relay terminal being a first relay terminal, comprising a memory, a transceiver, and a processor: a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations: if a first condition is met, sending a first message to a target device on a multi-hop relay link, the first condition comprising at least one of: a radio link failure (RLF) of a direct communication interface between the first relay terminal and a third relay terminal; a handover of the first relay terminal; a cell reselection of the first relay terminal; an RLF of a Uu interface of the first relay terminal; a failure of an end-to-end radio resource control (RRC) connection establishment between the first relay terminal and a network device; a failure of an RRC reconfiguration between the first relay terminal and the network device; a failure of an RRC reconfiguration of the direct communication interface between the first relay terminal and the third relay terminal; a failure of an end-to-end RRC connection establishment between the first relay terminal and a second remote terminal; a failure of an end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal; wherein the third relay terminal is a next hop node of the first relay terminal in a first transmission direction; and the multi-hop relay link comprises a terminal-to-network device multi-hop relay link and / or a terminal-to-terminal multi-hop relay link.

18. The relay terminal of claim 17, wherein, the processor, for reading the computer program in the memory, further performs the following operation: sending, to the third relay terminal, indication information, the indication information being used to indicate at least one of: a handover of the first relay terminal; a cell reselection of the first relay terminal; an RLF of a Uu interface of the first relay terminal; a failure of an end-to-end RRC connection establishment between the first relay terminal and a network device; a failure of an RRC reconfiguration between the first relay terminal and the network device; a failure of an end-to-end RRC connection establishment between the first relay terminal and a second remote terminal; a failure of an end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal; wherein the third relay terminal is a next hop node of the first relay terminal in the first transmission direction.

19. The relay terminal of claim 17, wherein, the first message further comprises second information, the second information comprising at least one of: an identity of the first relay terminal; an identity of the third relay terminal, the third relay terminal being a next hop node of the first relay terminal in the first transmission direction; type indication information.

20. The relay terminal of claim 19, wherein, in a case where the multi-hop relay link is a terminal-to-network device multi-hop relay link, the type indication information is used to indicate any one of: an RLF of a direct communication interface of the first relay terminal; a handover of the first relay terminal; a cell reselection of the first relay terminal; an RLF of a Uu interface of the first relay terminal; a failure of an end-to-end RRC connection establishment between the first relay terminal and a network device; a failure of an RRC reconfiguration between the first relay terminal and the network device; a failure of an RRC reconfiguration of the direct communication interface of the first relay terminal.

21. The relay terminal of claim 19, wherein, in a case where the multi-hop relay link is a terminal-to-terminal multi-hop relay link, the type indication information is used to indicate any one of: an RLF of a direct communication interface of the first relay terminal; a failure of an RRC reconfiguration of the direct communication interface of the first relay terminal. The end-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails; The end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

22. The relay terminal of claim 17, wherein, The first message includes first information, and the first information includes at least one of the following: An identifier of the first remote terminal; A local identifier of the first remote terminal; An identifier of the second remote terminal; Multi-hop path identification information; Hop count identification information in the first transmission direction; A combination of an identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal; Terminal identification information allocated to the first remote terminal by a network device; The first remote terminal is the first terminal in the first transmission direction, and the target communication peer of the first remote terminal is a second remote terminal or a network device; the target device is a previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal; The first transmission direction includes one of the following: A transmission direction from the first remote terminal to the network device; An uplink transmission direction; A transmission direction from the first remote terminal to the second remote terminal.

23. The relay terminal of claim 17, wherein, The first message is a direct communication interface notification message.

24. A target device, the target device being a first remote terminal or a second relay terminal, comprising a memory, a transceiver, and a processor: The memory is configured to store a computer program; the transceiver is configured to transceive data under control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations: Receiving a first message sent by a first relay terminal on a multi-hop relay link; wherein, The first remote terminal is the first terminal in the first transmission direction, and the target communication peer of the first remote terminal is a second remote terminal or a network device; the target device is a previous hop node of the first relay terminal in the first transmission direction, and the previous hop node of the first relay terminal is the first remote terminal or a second relay terminal; The first transmission direction includes one of the following: A transmission direction from the first remote terminal to the network device; An uplink transmission direction; A transmission direction from the first remote terminal to the second remote terminal.

25. The destination device of claim 24, wherein, In the case where the target device is a second relay terminal, the processor configured to read the computer program in the memory further performs the following operation: Determining whether to send a second message to a previous hop node of the target device in the first transmission direction according to the first message; In the case where the previous hop node of the target device in the first transmission direction is a relay terminal, the second message includes first information.

26. The target device of claim 24 or 25, wherein, The multi-hop relay link includes a terminal-to-network device multi-hop relay link and / or a terminal-to-terminal multi-hop relay link; the first message further includes second information, and the second information includes at least one of the following: An identifier of the first relay terminal; An identifier of a third relay terminal, the third relay terminal being a next hop node of the first relay terminal in the first transmission direction; Type indication information.

27. The destination device of claim 26, wherein, In the case where the multi-hop relay link is a terminal-to-network device multi-hop relay link, the type indication information is used to indicate any one of the following: RLF occurs on the direct communication interface of the first relay terminal; Handover occurs on the first relay terminal; Cell reselection occurs on the first relay terminal; RLF occurs on the Uu interface of the first relay terminal; End-to-end RRC connection establishment between the first relay terminal and the network device fails; RRC reconfiguration between the first relay terminal and the network device fails; RRC reconfiguration on the direct communication interface of the first relay terminal fails.

28. The destination device of claim 26, wherein, In the case of the multi-hop relay link being a terminal-to-terminal multi-hop relay link, the type indication information is used to indicate any of the following: RLF occurs on the direct communication interface of the first relay terminal; RRC reconfiguration on the direct communication interface of the first relay terminal fails; End-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails; End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

29. The destination device of claim 24, wherein, The first information included in the first message includes at least one of the following: An identifier of the first remote terminal; A local identifier of the first remote terminal; An identifier of the second remote terminal; Multi-hop path identification information; Hop count identification information in the first transmission direction; A combination of an identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal; Terminal identification information allocated by the network device for the first remote terminal.

30. The destination device of claim 24, wherein, The first message is a direct communication interface notification message. 31.A relay terminal, the relay terminal being a third relay terminal, comprising a memory, a transceiver, and a processor: The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations: In the case that the second condition is met, a third message is sent to a target communication peer of the first remote terminal on the multi-hop relay link; wherein, The second condition includes at least one of the following: RLF occurs on the direct communication interface between the first relay terminal and the third relay terminal; The indication information sent by the first relay terminal is received; RRC reconfiguration fails on the direct communication interface between the first relay terminal and the third relay terminal; The indication information is used to indicate at least one of the following: Handover occurs on the first relay terminal; Cell reselection occurs on the first relay terminal; RLF occurs on the Uu interface of the first relay terminal; End-to-end RRC connection establishment between the first relay terminal and the network device fails; RRC reconfiguration between the first relay terminal and the network device fails; End-to-end RRC connection establishment between the first relay terminal and the second remote terminal fails; End-to-end RRC reconfiguration between the first relay terminal and the second remote terminal fails.

32. The relay terminal of claim 31, wherein, The target communication peer of the first remote terminal is the second remote terminal or the network device; The third information included in the third message includes at least one of the following: An identifier of the first remote terminal; A local identifier of the first remote terminal; An identifier of the second remote terminal, the second remote terminal being a communication peer of the first remote terminal; Multi-hop path identification information; Hop count identification information in the first transmission direction; A combination of an identifier of the first remote terminal and an identifier of a target communication peer of the first remote terminal; Terminal identification information allocated by the network device for the first remote terminal; Transmission direction indication information; Type indication information; The first remote terminal is a first terminal in a first transmission direction; and the third relay terminal is a next-hop node of the first relay terminal in the first transmission direction. The first transmission direction includes one of: A transmission direction from the first remote terminal to a network device; An uplink transmission direction; A transmission direction from the first remote terminal to a second remote terminal.

33. An information transmission apparatus applied to a first relay terminal, the apparatus comprising: A first sending unit configured to send a first message to a target device on a multi-hop relay link if a first condition is met, the first condition including at least one of: A radio link failure (RLF) of a direct communication interface between the first relay terminal and a third relay terminal; A handover of the first relay terminal; A cell reselection of the first relay terminal; An RLF of a Uu interface of the first relay terminal; A failure of an end-to-end radio resource control (RRC) connection establishment between the first relay terminal and a network device; A failure of an RRC reconfiguration between the first relay terminal and the network device; A failure of an RRC reconfiguration of the direct communication interface between the first relay terminal and the third relay terminal; A failure of an end-to-end RRC connection establishment between the first relay terminal and a second remote terminal; A failure of an end-to-end RRC reconfiguration between the first relay terminal and the second remote terminal; The third relay terminal is a next-hop node of the first relay terminal in a first transmission direction; and the multi-hop relay link includes a multi-hop relay link from a terminal to a network device and / or a multi-hop relay link from a terminal to a terminal.

34. An information transmission apparatus applied to a target device, the apparatus comprising: A first receiving unit configured to receive a first message sent by a first relay terminal on a multi-hop relay link; The first remote terminal is a first terminal in a first transmission direction, a target communication peer of the first remote terminal is a second remote terminal or a network device, the target device is a previous-hop node of the first relay terminal in the first transmission direction, and the previous-hop node of the first relay terminal is the first remote terminal or a second relay terminal. The first transmission direction includes one of: A transmission direction from the first remote terminal to a network device; An uplink transmission direction; A transmission direction from the first remote terminal to a second remote terminal.

35. An information transmission apparatus applied to a third relay terminal, the apparatus comprising: A second sending unit configured to send a third message to a target communication peer of a first remote terminal on a multi-hop relay link if a second condition is met; The second condition includes at least one of: An RLF of a direct communication interface between the first relay terminal and the third relay terminal; Receiving indication information sent by the first relay terminal; An RRC reconfiguration failure of the direct communication interface between the first relay terminal and the third relay terminal; The indication information is used to indicate at least one of: A handover of the first relay terminal; A cell reselection of the first relay terminal; An RLF of a Uu interface of the first relay terminal; A failure of an end-to-end RRC connection establishment between the first relay terminal and a network device; RRC reconfiguration failure between the first relay terminal and the network device; End-to-end RRC connection setup failure between the first relay terminal and the second remote terminal; End-to-end RRC reconfiguration failure between the first relay terminal and the second remote terminal.

36. A processor-readable storage medium having stored a program for causing the processor to execute the method of any one of claims 1-7, 8-14, 15-16.

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